Inline all possible functions that are used only once

[marvinhagemeister]

• Update CHANGELOG.md with your change (include reference to issue & this PR)
• Make sure all of the significant new logic is covered by tests
• Rebase your changes on master so that they can be merged easily
• Make sure all tests and linter rules pass

This PR contributes the following changes:

• Inline both isFunction and isOptionsFunction which are only ever used once.
• Move printStackTrace and format out of doRunQuery so that they are not recreated each time doRunQuery is called

[apollo-cla]

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